US20220191951A1 - Method and apparatus for establishing radio bearer - Google Patents

Method and apparatus for establishing radio bearer Download PDF

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Publication number
US20220191951A1
US20220191951A1 US17/442,956 US202017442956A US2022191951A1 US 20220191951 A1 US20220191951 A1 US 20220191951A1 US 202017442956 A US202017442956 A US 202017442956A US 2022191951 A1 US2022191951 A1 US 2022191951A1
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Prior art keywords
user equipment
radio bearer
data
data packet
sent
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Xing Liu
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Spreadtrum Communications Shanghai Co Ltd
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Spreadtrum Communications Shanghai Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0252—Traffic management, e.g. flow control or congestion control per individual bearer or channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0268—Traffic management, e.g. flow control or congestion control using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria

Definitions

  • the present disclosure relates to the field of communication technology, and particularly to a method and apparatus for establishing radio bearer.
  • V2X Vehicle to X
  • 3GPP 3rd Generation Partnership Project
  • the V2X communication includes Vehicle to Vehicle (V2V) communication, Vehicle to Infrastructure (V2I) communication and Vehicle to Pedestrian (V2P) communication.
  • V2X applications may improve driving safety, reduce congestion and vehicle energy consumption, and improve traffic efficiency and vehicle-mounted entertainment information, etc.
  • the V2V communication is a communication mode that is different from ordinary wireless cellular network communication.
  • UE User Equipment
  • base station equipment While in the V2V communication, a UE communicates directly with another UE, and a link between the UEs becomes a sidelink (SL).
  • SL sidelink
  • the fifth mobile communication refers to the fifth mobile phone communication standard, which is also referred to as the fifth generation mobile communication technology (abbreviated as 5G).
  • 5G is also referred to as New Radio (NR), and the application of V2X may be supported in 5G.
  • NR New Radio
  • data transmission between the US and the base station equipment is implemented by establishing a radio bearer (RB) and quality of service flow (QoS flow).
  • RB radio bearer
  • QoS flow quality of service flow
  • the present disclosure provides a method and apparatus for establishing radio bearer.
  • a method for establishing radio bearer, applied to a first user equipment includes:
  • an apparatus for establishing radio bearer, applied to a first user equipment includes:
  • FIG. 1 illustrates a flow chart of a method for establishing radio bearer according to an embodiment of the present disclosure.
  • FIG. 2 illustrates a flow chart of the method for establishing radio bearer according to another embodiment of the present disclosure.
  • FIG. 3 illustrates a flow chart of the method for establishing radio bearer according to an embodiment of the present disclosure.
  • FIG. 4 illustrates a layering diagram of an RLC layer in the method for establishing radio bearer according to an embodiment of the present disclosure.
  • FIG. 5 illustrates a block diagram of an apparatus for establishing radio bearer according to an embodiment of the present disclosure.
  • exemplary herein means “using as an example and an embodiment or being illustrative”. Any embodiment described herein as “exemplary” should not be construed as being superior or better than other embodiments.
  • radio bearers In a 5G NR communication system, data transmission between user equipment and base station equipment is implemented by establishing radio bearers and QoS flows. It is necessary to map and associate a data packet from an upper layer to a QoS flow.
  • One QoS flow has a corresponding QoS flow ID (QFI) and needs to be mapped and associated to a radio bearer.
  • QFI QoS flow ID
  • Different radio bearers may have different transmission parameter configurations to meet the requirements of different services.
  • different radio bearers are identified by different radio bearer identities (radio bearer ID).
  • the data transmission between the UEs in a unicast scenario may adopt a QoS model of the data transmission between the user equipment and the base station equipment, that is, the radio bearer is established by adopting mapping and association from the data to QoS flow and from the QoS flow to the radio bearer on the sidelink between the UEs.
  • the QoS flow and radio bearer established on the sidelink cannot be ensured to be consistent completely in terms of mapping rules and transmission parameter configuration, because the two UEs establish the QoS flow and the radio bearer based on respective core networks and base stations.
  • an NR wireless protocol stack is divided into two planes, i.e., a user plane (UP) and a control plane (CP).
  • the UP protocol stack is a protocol suite adopted in user data transmission.
  • the CP protocol stack is a protocol suite adopted in control signaling transmission of the system.
  • a UP protocol in the NR includes a Service Data Adaptation Protocol (SDAP) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, a Media Access Control (MAC) layer and a physical (PHY) layer successively from top to bottom.
  • SDAP layer is configured to execute the mapping and association from the QoS flow to the radio bearer and to identify the QFI in uplink and downlink data.
  • the PDCP layer and the RLC layer are configured with the radio bearer as granularity. Different radio bearers correspond to independent PDCP entities and RLC entities. One radio bearer may correspond to one or more DPCP entities and RLC entities.
  • the MAC layer is shared by a plurality of radio bearers and configured to multiplex the data transmitted by the plurality of radio bearers into one data packet to be sent by the PHY layer. When the MAC layer multiplexes the data of different radio bearers, a logical channel identity (LCID) of the corresponding radio bearer is carried in MAC sub headers of the data of different radio bearers so as to express that the data in the data packet is sourced from different radio bearers.
  • a receiver After receiving the data packet, a receiver performs de-multiplexing on the data packet based on the LCD and sends the data in different radio bearers to the corresponding RLC entities and PDCP entities.
  • the RLC layer performs data transmission in three modes, i.e., a transparent mode (TM), an unacknowledged mode (UM) and an acknowledged mode (AM).
  • TM transparent mode
  • UM unacknowledged mode
  • AM acknowledged mode
  • TM transparent mode
  • UM unacknowledged mode
  • AM acknowledged mode
  • the sender sends the data packet to the receiver through the radio bearer established with the receiver, and the receiver needs to return to the sender an RLC status report on whether the data packet is received successfully.
  • the sender judges whether the data packet needs to be retransmitted based on the RLC status report received by the receiver and determines the data packet to be retransmitted from a retransmission buffer when it is determined that the retransmission is needed.
  • the MAC layer of the first user equipment cannot judge the data packet 2 and the status report 1 are sent to which RLC entity, resulting in confusion and errors in data receiving.
  • the above problems may be solved in two aspects.
  • the data packet 2 and the status report 1 are identified and sent to the corresponding RLC entities; the configurations of the data packet 2 and the status report 1 are unified, thereby ensuring that the RLC entities can unpack the data; and the first user equipment and the second user equipment receive the data packet 2 and the status report 1 through different radio bearers.
  • the following are several implementation examples provided by the present disclosure, and those skilled in the art may modify the implementation examples according to the following examples and actual needs, which is not limited by the present disclosure.
  • FIG. 1 illustrates a flow chart of a method for establishing radio bearer according to an embodiment of the present disclosure. As shown in FIG. 1 , the method is applied to first user equipment. The method includes S 11 to S 14 .
  • radio bearer configuration information of the second user equipment sent by the second user equipment is received.
  • a first radio bearer for sending data to the second user equipment is established (or updated) based on the radio bearer configuration information of the second user equipment.
  • first data is sent to the second user equipment through the first radio bearer.
  • the first data may include at least one of a data packet sent by the first user equipment to the second user equipment or a status report generated by the first user equipment in response to the data packet sent by the second user equipment.
  • the user equipment may be terminal equipment in various forms, including access terminals, subscriber units, subscriber stations, moving stations, mobile stations (built MS), remote stations, remote terminals, mobile equipment, user terminals, terminal equipment, wireless communication equipment, user agent or user apparatuses.
  • the terminal equipment may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), handheld equipment with wireless communication functions, computing equipment or other processing equipment connected to wireless modems, vehicle-mounted equipment, wearable equipment, terminal equipment in the future 5G network or terminal equipment in the future evolved Public Land Mobile Network (PLMN), which is not limited in the present disclosure.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • the application of the radio bearer configuration information may include the establishment of a radio bearer mapping rule based on the radio bearer configuration information.
  • the radio bearer configuration information of the second user equipment may include at least one of a mapping and association rule between the data packet and a QoS flow of the second user equipment, a mapping and association rule between the QoS flow and the radio bearer of the second user equipment, or transmission parameters of the radio bearer of the second user equipment.
  • the application of the radio bearer configuration information of the second user equipment may include at least one of:
  • the mapping and association rule from the data packet to the QoS flow, the mapping and association rule from the QoS flow to the radio bearer, and configuration of the transmission parameters of the radio bearer may be unified between the first user equipment and the second user equipment to ensure that the first user equipment and the second user equipment have the same configuration during the data transmission, so that the data packet sent by the first user equipment and the status report generated by the first user equipment in response to the data packet sent by the second user equipment both may have the same configuration, may be unpacked by the RLC entity, and may not need to be identified by the second user equipment after receiving. Therefore, the confusion and errors in the data receiving can be avoided, the accuracy of the data transmission between the user equipment through the radio bearer can be ensured, and the data transmission process of both of the user equipment is no longer affected by whether the radio bearer is the same one or not.
  • the method further includes:
  • the first user equipment when the first user equipment cannot establish the radio bearer mapping rule and radio bearer independently and needs to request the base station or core network, the first user equipment needs to forward the radio bearer configuration information to the base station and/or the core network after receiving the radio bearer configuration information, and then applies the radio bearer configuration information after obtaining the acknowledgement of the base station or core network.
  • the first user equipment can establish the radio bearer independently, it is unnecessary to forward the radio bearer configuration information to the base station or core network for acknowledging.
  • the base station may also be referred to as base station equipment, which is an apparatus deployed in the radio access network (RAN) and configured to provide a radio communication function.
  • the equipment providing the base station function in a 2G network includes a base transceiver station (BTS); the equipment providing the base station function in a 3G network includes a NodeB; the equipment providing the base station function in a 4G network includes an evolved NodeB (eNB); the equipment providing the base station function in wireless local area networks (WLAN) is an access point (AP); and the equipment providing the base station function in the 5G new radio (NR) is gNB and continuously evolved node B (ng-eNB), wherein the gNB and the terminal are communicated through an NR technology, the ng-eNB and the terminal are communicated through an Evolved Universal Terrestrial Radio Access (E-UTRA) technology, and the gNB and ng-eNB may both be connected to the 5G core network.
  • the core network may be an evolved packet core (EPC) and a 5G core network, and may also be a novel core network in the future communication system.
  • the 5G core network is formed by a group of devices, and realizes access and mobility management functions (AMF) such as mobility management, a User Plane Function (UPF) providing packet routing and forwarding and QoS (Quality of Service) management, a Session Management Function (SMF) providing session management, IP address allocation and management, etc.
  • EPC may be composed of MME providing functions such as mobility management and gateway selection, a Serving Gateway (S-GW) providing a packet forwarding function, and a PDN Gateway (P-GW) providing functions such as terminal address allocation, rate control and the like.
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • P-GW PDN Gateway
  • FIG. 2 illustrates a flow chart of the method for establishing radio bearer according to another embodiment of the present disclosure. As shown in FIG. 2 , the method is applied to first user equipment. The method includes S 21 to S 23 .
  • the logical channel identity of the second radio bearer is sent to a base station and/or a core network, so that the base station and/or the core network establishes a third radio bearer for the first user equipment, and the logical channel identity of the third radio bearer is different from the logical channel identity of the second radio bearer.
  • the second data may include a data packet sent by the first user equipment to the second user equipment.
  • the second radio bearer includes a radio bearer adopting an acknowledged mode (AM).
  • AM acknowledged mode
  • the second radio bearer is the radio bearer that is already established by the second user equipment and configured to send the data packet to the first user equipment. In this way, it can ensure that the logical channel identity of the third radio bearer established by the base station and/or the core network for the first user equipment is different from the logical channel identity of the second radio bearer.
  • the method further includes:
  • the first user equipment may send the second data to the second user equipment through the third radio bearer.
  • the first user equipment may return the status report (i.e., the third data) to the second user equipment through the second radio bearer after receiving the data packet sent by the second user equipment through the second radio bearer.
  • the data packet sending process and the status report sending process of the first user equipment are carried out respectively through different radio bearers, so that the data receiving confusion of the UEs may be avoided.
  • the method may further include: during the logical channel prioritization (LCP), when priorities corresponding to the third radio bearer and the second radio bearer are the same, the resources are allocated preferentially to the second radio bearer (i.e., the third data), that is, the third data is sent to the second user equipment preferentially through the second radio bearer.
  • LCP logical channel prioritization
  • different radio bearers have different priorities.
  • the transmission resources may be allocated preferentially to the radio bearer with high priority.
  • the priority of the third data is higher than the second data, and the first user equipment allocates the resources preferentially to the third data.
  • FIG. 3 illustrates a flow chart of the method for establishing radio bearer according to an embodiment of the present disclosure. As shown in FIG. 3 , the method is applied to first user equipment. The method includes S 31 to S 33 .
  • the fourth data includes at least one of a data packet sent by the second user equipment to the first user equipment or a status report generated by the second user equipment in response to the data packet sent by the first user equipment through the fourth radio bearer.
  • the fourth radio bearer is established between the second user equipment and the first user equipment to perform data transmission.
  • the process in which the fourth radio bearer is established between the second user equipment and the first user equipment includes:
  • the first user equipment also utilizes the fourth radio bearer to send a data packet (data packet b) to the second user equipment and/or to receive a status report (status report b) sent by the second user equipment in response to the data packet (i.e., the data packet b) sent by the first user equipment to the second user equipment through the fourth radio bearer, and establishes the corresponding RLC entity.
  • the second user equipment may also utilize the fourth radio bearer to receive the data packet (i.e., the data packet b) sent by the first user equipment and/or to send the status report (i.e., the status report b) in response to the data packet sent by the first user equipment to the second user equipment through the fourth radio bearer, and establishes the corresponding RLC entity.
  • the fourth radio bearer described in the present disclosure refers to the radio bearer having the same LCID in the first user equipment and the second user equipment. Therefore, when the fourth radio bearer has the same LCID but different radio bearer ID in the first user equipment and the second user equipment, the fourth radio bearer may be considered as two different radio bearers. When the fourth radio bearer has the same LCID and the same radio bearer ID in the first user equipment and the second user equipment, the fourth radio bearer may be considered as one radio bearer.
  • the data transmission process includes at least one of: the first user equipment receives the data packet a (i.e., one type of the fourth data) sent by the second user equipment through the fourth radio bearer; the first user equipment sends the status report a in response to the data packet a to the second user equipment through the fourth radio bearer; the first user equipment sends the data packet b to the second user equipment through the fourth radio bearer; or the first user equipment receives the status report b (i.e., one of the fourth data) sent by the second user equipment in response to the data packet b through the fourth radio bearer.
  • the first user equipment receives the data packet a (i.e., one type of the fourth data) sent by the second user equipment through the fourth radio bearer
  • the first user equipment sends the status report a in response to the data packet a to the second user equipment through the fourth radio bearer
  • the first user equipment sends the data packet b to the second user equipment through the fourth radio bearer
  • the first user equipment receives the status report b (
  • the first user equipment sends different data to the corresponding RLC entity or RLC sublayer for processing after identifying the fourth data.
  • the fourth data is identified to obtain the identification result, which may include any one of:
  • the configurations of the data packets send by the two user equipment are different.
  • the fourth data received by the first user equipment is taken as an example to describe the embodiment III.
  • the “D/C” domain occupies 1 bit, which is used to indicate whether the data is a data packet (i.e., data packet a) sent by the second user equipment to the first user equipment or a status report (i.e., status report b) generated by the second user equipment in response to the data packet sent by the first user equipment.
  • the MAC layer of the first user equipment may identify the fourth data based on different RLC headers.
  • the second user equipment may be controlled to mark different data by adding the indication information in the MAC sub header before sending the fourth data.
  • the MAC layer of the first user equipment may identify the fourth data by identifying the indication information of the MAC sub header.
  • FIG. 4 illustrates a layering diagram of an RLC layer in the method for establishing radio bearer according to an embodiment of the present disclosure.
  • the RLC layer of the first user equipment may be divided into one or more RLC sublayers, wherein the first RLC layer may be used to identify the RLC header of the fourth data, for example, to identify the fourth data through the “D/C” domain.
  • the second RLC sublayer in the RLC layer may be used to realize other functions of the RLC layer.
  • the method may further include:
  • the first user equipment since both of the first user equipment and the second user equipment send the data through the radio bearer with the logical channel identity of M, the first user equipment is taken as an example, there are cases that the status report a and the data packet b participate in packing simultaneously. Therefore, the first user equipment allocates the resources preferentially to the status report a, and allocates the surplus resources to the data packet b if there is any.
  • the method for establishing radio bearer provided by the embodiment of the present disclosure is applicable to 5 Generation (5G) communication systems, and also applicable to the 4G and 3G communication systems, and also applicable to various novel communication systems in the further such as 6G, 7G and the like. Moreover, the method for establishing radio bearer is also applicable to different network architectures, including but not limited to relay network architecture, double-link architecture, V2X architecture and other architectures.
  • 5G 5 Generation
  • 4G and 3G communication systems and also applicable to various novel communication systems in the further such as 6G, 7G and the like.
  • the method for establishing radio bearer is also applicable to different network architectures, including but not limited to relay network architecture, double-link architecture, V2X architecture and other architectures.
  • FIG. 5 illustrates a block diagram of an apparatus for establishing radio bearer according to an embodiment of the present disclosure. As shown in FIG. 5 , the apparatus is applied to first user equipment.
  • the apparatus includes an information receiving module 41 , a configuration applying module 42 , a first establishing module 43 and a first sending module 44 .
  • the information receiving module 41 is configured to receive radio bearer configuration information of second user equipment sent by the second user equipment.
  • the configuration applying module 42 is configured to apply the radio bearer configuration information of the second user equipment.
  • the first establishing module 43 is configured to establish a first radio bearer for sending data to the second user equipment based on the radio bearer configuration information of the second user equipment.
  • the first sending module 44 is configured to send first data to the second user equipment through the first radio bearer.
  • the first data includes at least one of a data packet sent by the first user equipment to the second user equipment or a status report generated by the first user equipment in response to the data packet sent by the second user equipment.
  • the radio bearer configuration information of the second user equipment includes at least one of a mapping and association rule between the data packet and a QoS flow of the second user equipment, a mapping and association rule between the QoS flow and the radio bearer of the second user equipment, or transmission parameters of the radio bearer of the second user equipment.
  • the configuration applying module 42 may include at least one submodule of:
  • the apparatus may further include:
  • the apparatus may further include:
  • the second radio bearer may include a radio bearer adopting an acknowledged mode.
  • the apparatus may further include:
  • the apparatus may further include:
  • the apparatus may further include:
  • the data identification module may include any one submodule of:
  • the apparatus may further include:
  • the apparatus for establishing radio bearer provided by embodiments of the present disclosure can avoid confusion and errors in data receiving, and ensure the accuracy of data transmission between the user equipment through the radio bearer.
  • terms “and/or” used herein is only an association relationship describing the associated objects, which means that there may be three relationships, for example, A and/or B may mean three situations: A exists alone, both A and B exist, and B exists alone.
  • the character “/” used here generally indicates that the associated objects are in an “or” relationship.

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EP3952600A1 (en) 2022-02-09
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